Folding-extension-head lifting-jack.



W. B. LASHAR. FOLDING'EXTENSION HEAD: LIFTING JACK.

- mrrucnmu FILED JAN.3l, 191s.

Patented May 23, 1916.

warren. B. meme, or nmnearon'r, comaczrroor, vAssrenoa 'roamnmcmr cn'am COMPANY, INCOBi'dEA-TED, OF BRIDGEPORT, CONNECTICUT, A. CORPORATION 01-? NEW YORK.

FOLDING-EXTENSION-HEAD LIETING-J'ACK.

. sion-Head Lifting-Jacks, of which the following is a specification, taken in connection with the accompanying drawing, which forms part of the same;

This invention relates to screw or other lifting jacks specially intended for automobile service and to folding or loosely pivoted extension heads therefor whereby the extension head is permanently connected to the lifting head of the jack so as to be instantly raised toits operative position extending the effective height of v the jack where alining members hold it firmly in alinement so long as the load acts thereon. I 'In the accompanying drawing showing in a somewhat diagrammatic way an illustra- 'tive embodiment of this invention, Figure 1 p is an elevation partly in-section. 'Fig. 2 is a partial elevation showing the extension head in lowered inoperative position and Fig, 3 is an enlarged elevation showing the extensionhe'ad n raised operative position.

The jack may comprise a frame 2 having a suitable base 1 secured thereto and having a lifting member comprising, lifting screw" 7 and a lifting head 8 which may be attached to the screw in any suitable way as by the' screw or retainer pin 9. This lifting screw may cooperate withsthe nut 4 revolubly mounted in the frame and rotated by capstan bars or rods which may be inserted inthe holes 24, for instance. Or the nut may be rotated byother. suitable actuating connections from the endless operating chain 6, for instance, which as indicated may cooperate with the guide casing 3 swivel-- ingly mountedon the shaft 5, these actuating connections being, if desired, in substan-v tial conformity withthe Lashar-Luce application 16,875 of March 25, 1915, which has matured into Patent '1,l74,0l7 of February 29, 1916, and on which this invention is based, it being of course understood that the details of these actuating connections form no part of the present invention. It desired, the lifting head 8 may be formed with the recessed or curved seat 10 to more readily center and retain an axle or other member to be raised by the jack and the extension Specification of Letters Patent.

of Fairfield, State of 16 on if desired, the

Patented May. 23 was.

Application filed January 31,1916. Serial No. 75,192.

head 12 permanently but loosely pivoted or connected with the head preferably engages it. at separated points on both sides of the lifting screw, such as 18, 22, to more certainly secure definite bearingtherewith in spite of the presence of dirt or the like which is aptto work into these parts under service conditions. For 4 this purpose the central rib of this extension head may have its lower end 13 relieved or upwardly extended so as toprevent the possibility o any contact adjacent the center of the lifting head. It is desirable to have the extension head formed with a relatively narrow lifting seat 19 forv which purpose the extension head may be upwardly tapered as indicated, this ar'rangement insurlng the somewhat definite centering of the load cooperating w-iththis extension head which correspondingly minimizes bending strains on the lifting screw ormemher which are of course more apt to be injurious when the lifting member is more fully extended under conditions when this extensionhead is brought into use. p y

The extension head may be permanently and loosely connected or. pivoted to the lifting head as by loosepin and slot connections between the parts which may readily be effected by forming a slotted connecting lug the extension head located in a recess 14 in the lifting head which is preferably sufficiently narrow to give transverse guidancetothis lug and thus contribute to the transverse alinement of the extension head when in raised operative position. As indi- 9 cated in Figs. 2 and 3 the connecting pin 11 is mounted-well within the lateral edge of the extension head which makes unnecessary any undesirable extension of this art, and the enlarged slot 15 with which this pin 00- operates is made ample so as to allow the .a radial aswell as the pivotal movement of the extension head to sufiicient extent to a raise it from the lowered inoperative position-shown in Fig. 2 to the raised operative position shown in Figs. 1 and 3.

Suitable alining means are preferably provided to insure the lateral alinement of the extension head so longas it is loaded and for this purpose the connecting lug 16 erably closely engages the inner end 0 the recess 14 in at least some part as indicated in Fig. 3 so as to prevent any further movement of theextension head in that direction when it/is in raised position as indicated "in 110 reff so 4 jcated directly in line with the lifting mein- Fig. 3. A suitable alining flange such as 21 may also be formed on a lifting head so as to be engaged by a flange-or projection 18 on the extension head and prevent its rearward movement'so long as the load is pressing this extension head downward. In this way the alinement f the parts under operating conditions is insured without any substantial interruption of the curved seat of the lifting head and without depending on the strength of the connecting pin so that there is correspondingly less danger of distorting or breaking this relatively light pin. At the saine tinie the parts are so loosely connected ithilt the extension head may be readily raised as soon as the jack is withdrawn from the load and the extent of upward movement is roughly indicated by the dotted osition oif the extension head in Fig. 3. t is thusseenl that the extension head can be raised so as to carry these alining members entirely, out of contact and thus allow the extension head to be swung,

or folded over so as to bring it intothe lowered inoperative position shown in Fig. 2 in which it is held by an alining projection 17 coiiperating with the recess 14-, for instance. In this position the extension head projects laterally to the minimum extent Letters Patent is set forth in the appended from the lifting member and is in fact lober and frame, the shape of the extension head being relied upon to prevent,- undesirable interference with the loweringmovement under these conditions -This invention has been described'in con-. -nect1on with anumber of illustrat ve embodiments, forms, parts. proportions, materials. and arrangementsrto the details ,of which disclosure the invention is not, of :course to be limited. since what ,is claimed as 'newand what is desired to be secured by claims: v

1. In lifting jacks for automobiles and "so forth, a supporting frame a lifting member coiiperating therewith and com-,

prising a lifting" screw.and a connected lifting headprovided with a recessed seat to receive the load, an extension head permanently and loosely connected to said lifting head and being upwardly tapered and provided with a narrowed recessed lifting seat, said extension head having, separated pports to engage said lift-- w head ar acent-its' lateral portions, a slotted connecting lug on said extension messes head extending into a recess in said lifting head and being transversely alined thereby, a connecting pin extending through said' slot to provide a permanent loose pin and slot connection for said extension head and alining. means to insure the lateral alinement of said extension head and comprising an alining flange on said lifting head to prevent outward movement of said connecting lug.

when said extension head is loaded.

:2. In lifting jacks for automobiles and so forth, a supporting frame, a lifting memliei'coiiperati q therewith and comprising a connected l1 ting head provided with a receased seat to receive the load, an extension head permanently and loosely connected to said lifting head and provided with'a narrowed recessed lifting seat. said extension head having separated supports to engage said lifting head adjacent its lateral por-' tions'. a slotted connecting lug on said extension head extending into a recess in said lifting head.. a connecting pin extending through said slot to. provide a permanent loose pin and slot connection for said extension head and alining meaiis to insure the lateral almement of said extension head and comprising an alining flange on said lifting head to prevent outward movement of said connecting lug when said extension head is loaded.

3. In'lifting jacks for automobiles and so forth, a supporting frame, a lifting member cobperating therewith and comprising a connected lifting head to receive the load.

and an extension head permanently and loosely coni-iertcdtosaid lifting head,. said extension head having separated supports to engage said lifting head adjacent its lateral portions.

WALTER B. LASHAR.

'itnesses:

WALTER F. Fi'izonnALD, CLARK 1. LANE, Jr. 

